Development and Validation of a One-Dimensional Co-Electrolysis Model for Use in Large-Scale Process Modeling Analysis
A one-dimensional chemical equilibrium model has been developed for analysis of simultaneous high-temperature electrolysis of steam and carbon dioxide (coelectrolysis) for the direct production of syngas, a mixture of hydrogen and carbon monoxide. The model assumes local chemical equilibrium among the four process-gas species via the shift reaction. For adiabatic or specified-heat-transfer conditions, the electrolyzer model allows for the determination of coelectrolysis outlet temperature, composition (anode and cathode sides), mean Nernst potential, operating voltage and electrolyzer power based on specified inlet gas flow rates, heat loss or gain, current density, and cell area-specific resistance. Alternately, for isothermal operation, it allows for determination of outlet composition, mean Nernst potential, operating voltage, electrolyzer power, and the isothermal heat requirement for specified inlet gas flow rates, operating temperature, current density and area-specific resistance. This model has been developed for incorporation into a system-analysis code from which the overall performance of large-scale coelectrolysis plants can be evaluated. The one-dimensional co-electrolysis model has been validated by comparison with results obtained from a 3-D computational fluid dynamics model and by comparison with experimental results.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- DOE - EE
- DOE Contract Number:
- DE-AC07-99ID-13727
- OSTI ID:
- 924493
- Report Number(s):
- INL/CON-07-12236; TRN: US200809%%346
- Resource Relation:
- Conference: Fifth International Fuel Cell Science, Engineering, and Technology Conference,New York, NY,06/18/2007,06/20/2007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
08 HYDROGEN
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
CARBON DIOXIDE
CARBON MONOXIDE
CATHODES
COMPUTERIZED SIMULATION
CURRENT DENSITY
ELECTROLYSIS
FLUID MECHANICS
FUEL CELLS
GAS FLOW
HYDROGEN
MIXTURES
PERFORMANCE
PRODUCTION
SIMULATION
STEAM
VALIDATION
co-electrolysis
process modeling
synthetic fuels